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Router Memory

Types of Memory

Cisco 1721 Router Hardware Installation Guide

1-8

The Cisco 1721 router has the following types of memory:

Dynamic random-access memory (DRAM)—This is the main storage

•

memory for the router. DRAM is also called working storage. It contains the

dynamic configuration information. The Cisco 1721 router stores a working

copy of the Cisco IOS software, dynamic configuration information, and

routing table information in DRAM.

Nonvolatile random-access memory (NVRAM)—This type of memory

•

contains a backup copy of your configuration. If the power is lost or the router

is turned off, this backup copy enables the router to return to operation

without reconfiguration.

Flash memory—This special kind of erasable, programmable memory

•

contains a copy of the Cisco IOS software. The Flash memory structure can

store multiple copies of the Cisco IOS software. You can load a new level of

the operating system in every router in your network and then, when

convenient, upgrade the whole network to the new level.

The Cisco 1721 router supports a maximum of 32MB Flash memory and 128MB

DRAM. Use the show version command to view the amount of DRAM, NVRAM,

and Flash memory stored in your router. The following example of the

show version command output displays the amount of memory in this router.

1721# show version

Cisco Internetwork Operating System Software

IOS (tm) C1700 Software (C1700-K9SY-M), Version 12.2(4)YA EARLY

DEPLOYMENT RELEASE SOFTWARE (fc1)

TAC Support: http://www.cisco.com/tac

Compiled Mon 14-Jan-02 16:34 by ramesh

Image text-base: 0x80008108, data-base: 0x80BC77E8

ROM: System Bootstrap, Version 12.2(7r)XM1, RELEASE SOFTWARE (fc1)

1721 uptime is 4 days, 23 hours, 54 minutes

System returned to ROM by reload

Running default software

Chapter 1

Cisco 1721 Router Overview

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